mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed from cooling hydrothermal veins or magma in various igneous and metamorphic environments. This specimen appears to be a water-worn or tumbled pebble.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative stones or pocket pebbles in the lapidary trade.
Geological facts
The milky appearance is caused by tiny inclusions of liquid or gas trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth.
Field identification & locations
Identify by its white opaque color and inability to be scratched by a steel knife. Commonly found in riverbeds, beaches, and quartz veins globally. Collectors look for high translucency or unique shapes.
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